Absolute ionization cross sections for the L subshells of Au by proton bombardment (0.25-5.2 MeV) have been determined from data obtained using a Si(Li) detector and the presently available values for radiative transition probabilities, fluorescence yields, and Coster-Kronig factors. The measured cross sections are compared with values calculated by Choi using the plane-wave Born approximation (PWBA) with either relativistic or nonrelativistic hydrogenic wave functions for the Au electrons. Except at low energies (ηLθL2<0.2) where the uncorrected PWBA is questionable, the agreement is good. A plateau in the 2s ionization cross section attributable to the bimodal 2s-electron wave function is observed in the region 0.5-1.0 MeV. Ionization by He ions (1-12 MeV) is similar, but significant differences in subshell behavior are observed.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics